Pulsator for milking-machines.



D, BROWN PULSATOE POE MILKING MACHINES.

APPLICATION FILED APR.20, 1909.

Patented June 21, 1910.

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DAVID BROWN, 0F SPOKANE, WASHINGTON.

PULSAIGR FOR MILIflNG-MACHINES.

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Specification of Letters Patent. Pmtgntgfi June 21;,1Q10,

Application filed April 20, 1909. Serial No. 490,980.

To all whom it may concern:

Be it known that 1, DAVID Bnown, a citizen of the United States, residing at Spokane, in the county of Spokane and State of \Vashington, have invented a new and useful Pulsator for Milking-Machines, of which the following is a specification.

This invention relates to pneumatic milking machines and more particularlyto that part of the machine better known as the pulsator 9 The object of the invention is to provide a pulsator which is simple in construction, inexpensive to manufacture, perfectly sanitary, and which can be easily understood by an ordinary operator. 7

A further object is to provide a pulsatorwhich can readily be removed tro1n-the driving mechanism or engine and can thus be k'ept entirely sterile, said pulsator being entirely free of holes, slots, or the like, such as ordinarily utilized, and which are quite diilicultto clean.

Another object is to provide a machine of this character which is entirely free of springs, gears and. other parts liable to get out of order.

With these and other objects in view the invention cons sts of certain novel details the engine, and showing the pulsator in its lower position. Fig. 3 is a similar view, showing the pulsator in its raised position. Fig. 4 is a section through a portion of the engine and showing the air inlet portand the valve.

Referring to the figures by characters of reference 1 designates a milk receptacle of the ordinary type, on which 1s arranged a cover 2, there being a gasket 3, of rubber or the'like interposed between the cover and.

the receptacle so as to prevent lei large. The cover 2 is formed with a central u 'istanding portion 4 having a cylindrical bore 5 therethrough, there being radial ports (3 communicating with the bore and having glass inspection tubes 7 extending therefrom andsecured in any preferred manner upon the cover. Each of these tubes has its outer end attached to a nozzle 8 from whichif'a flexible tube 9 of any suitable length ex vmunication with an exhausting pump 14 through a pipe 15, wh1ch opens through the cover 2-'and also into a port- 16 extending to the engine. The two ends of the piston 13 are closed by screw plugs 12 a and 13 to retain the valve 13 within the piston.

The ports .6 are arranged in the same horizontal. plane and an air inlet port 17 opens into the bore 5 at a point above the ports 16, said inlet port being provided with a suitable air valve 18 of the ordinary or any preferred construction.

The piston 13 of the air engine has a central screw-threaded socket 19 in one end and below the plug 13 and into which projects the screw-threaded end 20 of the pulsator 21'.

This pulsator is designed'to fit snugly and reciprocate Within the bore 5, it being pro vided at an intermediate point with an annular groove 22, while the lower end of the pulsator has opposed portions cut away, as indicated at 23. The distance between these cut-away portions and the groove 22 is such that when the pulse tor is in its lowered position the ports 6 will be partly closed by the said pulsator, but said ports will cornn uniirough the'groove 22 with the air inlet receptacle 1 and the englne set in motion.

While the piston 13 of the pulsator is in raised position the ports 16 are in communication with receptacle 1 through the bore 5 and therefore a suction will be established throu h the tubes 7 and 9 and the cups 10 so as to raw milk from the teats and into the receptacle. During the return stroke otthe' piston and the pulsator the ports 16 are out OK from communication with the receptacle 1 and are instead placed in communication with the port 17 through the groove 22. Air will therefore promptly rush into the ports 16 and the tubes 7 and 9 and the cups 10 so as to break the suction and momentarily relieve the teats and thus permit the milk to flow downward and fill them prior to the next suction. As ,soon as the pulsator is again carried upwardly by the piston suction is reestablished bet-ween the receptacle 1 and the ports 6 and the milk whmn has accumulated within the teats is thus drawn through the orts and into the receptacle in the manner iereinbefore described. Obviously this operation can continue as long as the pump 14 is' in communication with the apparatus and as soon 'as the milking operation has been completed the valve 15 is closed.

When it is;desired to clean the apparatus the c linder 12 is lifted bodily'from the boss than the pulsator can then be unscrewed {rpm the piston 13 and thoroughly cleaned inasmuch as it is entirely free of all open- 1. In a milking machine, a base having a bore extending therethrough and ports opening into the bore, an engine mounted upon the base and having an interiorly screw tithreaded piston, and a pulsator extending beyond one end of the piston and having a screw threaded end detachably engaging the thread in one end of said piston, sa-id pul sator being movable within the bore and having exterior means for establishing communication between the ports when the pis-.

ton is in its lowermost position.

2. A milking machine including an engine piston mounted for reciprocation, and a port controlling pulsator reduced solely at one end and at an intermediate point, the other end of said pulsator being screwed into and detachably engaged by-the piston.

3. Ina milking machine, a pulsator valve including a cylindrical body having opposed portions of one end cut away and having an intermediate annular groove, there being exterior screw threads upon the other end portion of said body.

In testimony that I claim the foregoing as my own, I have hereto aiiixed my signature in the presence of two witnesses.

DAVID BRONVN Witnesses MARY E. OoWAN,

. JOHN E. BLAIR. 

